Chapter 47. CVD Processing of Fiber Coatings for CMCs

  1. John B. Wachtman Jr
  1. C. J. Griffin and
  2. R. R. Kieschke

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314715.ch47

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4

How to Cite

Griffin, C. J. and Kieschke, R. R. (1995) CVD Processing of Fiber Coatings for CMCs, in Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314715.ch47

Author Information

  1. 3M, MMC Dept., 3M Center, Bid 60-1N-01, St Paul, MN 55144, USA

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1995

ISBN Information

Print ISBN: 9780470375372

Online ISBN: 9780470314715

SEARCH

Keywords:

  • nextel;
  • degradation;
  • deposition;
  • multi-layer;
  • defect-free

Summary

Ceramic matrix composites (CMCs) need fiber coatings to achieve strong, tough behavior. When selecting a fiber coating method, fiber properties, coating material properties, coating complexity and cost are considerations. Emphasis should also be placed on the manufacturability of that system. There must be an understanding of the coating processes to determine if coatings can be made at reasonable rates, and if the composite system can tolerate the defects inherent in all coating processes.

The coating of Nextcl 610 and Nicalon fiber tows is described. Reasons for selecting chemical vapor deposition (CVD) are given, and the effects of process parameters on coating properties such as thickness, uniformity, soot/roughness and clustering are discussed, including an analysis of fiber strength degradation. Parameters under consideration include precursor selection and deposition rate.